JP2000299748A - Communication method using public line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a communication method that enhances security, prevents a unit side reply device from being malfunctioned and uses a public channel. SOLUTION: An information collection unit 4 transmits a telephone call signal and disconnects it through a public channel 3 to unit side reply devices 2, each unit side reply device 2 stores a telephone call signal through the public channel 3, discriminates whether or not the stored call signal is an information request instruction from the information collection unit 4, and transmits a telephone call signal to the information collection unit 4 through the public channel 3 when discriminating it that the call signal is the information request instruction, and transmits information to the information collection unit 4 through the public channel 3 when confirming automatic incoming call from the information collection unit 4. According to this method, the unit side reply device 2 discriminates the information request instruction of the information collection unit 4, reconnects the public channel 3 and transmits information to the information collection unit 4. Thus, it is prevented that information is sent to a 3rd party from the unit side reply device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method using a public line as a communication path.

[0002]

2. Description of the Related Art Conventionally, a communication device connected to a public line (for example, an information management device installed in a remote place and having various information) receives a telephone call signal through the public line and changes the line by a modem. When a connection is made and an instruction signal (for example, an information request signal) is confirmed via this line, execution is performed in accordance with the instruction. For example, in the case of an information request instruction, the requested information is stored in the connected state. Sending to the other party via the line.

[0003]

However, in the above-mentioned communication device, when a telephone number and a command are leaked to a third party when a line is connected and a command is responded, an incorrect operation is commanded or a communication is not performed. It is conceivable that information on the device is leaked, and there is a possibility that a malfunction occurs in the communication device due to an incorrect number or a mischief call. If a dedicated line is used, these problems do not occur, but there is a problem that the cost increases.

Accordingly, an object of the present invention is to provide a communication method capable of improving confidentiality and preventing a malfunction of a communication device (information management response unit).

[0005]

According to one aspect of the present invention, an information management response unit having information and an information request command issued to the information management response unit are provided. A method of communicating through a public line between an information collecting unit that outputs the information and collecting the information, wherein the information collecting unit transmits a call signal of a telephone to the information management response unit through the public line. When the call is disconnected and the information management response unit receives the call signal of the public line telephone, it stores the call signal. When the call signal ends, the information management response unit determines whether or not it is the information request command of the information collection unit based on the stored call signal. If it is determined that the command is an information request command of the information collecting unit, a call signal of the telephone is transmitted to the information collecting unit through the public line, and the information collecting unit transmits the call signal of the information management response unit of the public line. Flip performs automatic incoming call, information management response unit, when confirming automatic call, is characterized in transmitting the item of information through the public line to the information collection unit.

According to this method, the information management response unit determines whether or not the command is an information request command of the information collection unit based on a call signal of the telephone.
The public line is reconnected from here to the telephone number of the information collection unit stored in advance, and the information is transmitted. This prevents information from being transmitted to the third party from the information management responding unit even if the information management responding unit accidentally matches, or if the third party learns how to access the information management responding unit in some way.

According to a second aspect of the present invention, in the first aspect of the present invention, the information collection unit repeats transmission and disconnection of the call signal in a specific pattern, and the information management response unit transmits the call signal. The reception and termination of the signal are repeated in a specific pattern, thereby determining whether or not the command is an information request command of the information collection unit.

According to this method, the reception and termination of the call signal are repeated in a specific pattern to determine whether or not the command is an information request command of the information collection unit. (Call back) and send the information. This prevents information from being transmitted to a third party. The invention described in claim 3 is the first invention.
Alternatively, in the invention according to claim 2, the information management response unit is connected to a monitoring target device that manages information, accumulates information of the monitoring target device, and connects a public line to the information collection unit. Transmitting the information of the monitored device.

According to this method, it is determined whether or not the command is an information request command of the information collecting unit based on a call signal, and when it is determined, the public line is reconnected from here (call back), and
Transmit the stored information of the monitoring target device. This allows
This prevents the information on the monitored device from being transmitted to a third party.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a remote response system using a communication method using a public line according to an embodiment of the present invention. A plurality of machine-side response devices installed on the machine side such as a multi-story parking facility equipped with a mechanical device and automatically collecting information such as the operating state of the monitored device (monitored device) 1 such as the mechanical device (Information management response section) 2
Has a function of collecting and accumulating information transmitted using the public line 3 and connected to the plurality of machine-side response devices 2 via the public line 3, and optionally displaying the information according to the application. For example, it comprises an information collection device (information collection unit) 4 installed in a maintenance center (a maintenance company in the case of a multi-story parking facility).

The configuration of the above-mentioned machine side response device 2 will be described in detail. The machine-side response device 2 includes a monitoring unit 11, a storage unit 12 for temporarily storing information of the monitored device 1, a line connection unit 13 for connecting the machine-side response device 2 to the public line 3, and a reception monitoring unit 14. , And a transmission unit 15. The monitoring unit 11 issues a command for collecting information to the monitored device 1 at a predetermined time interval and collects information of the monitored device 1 in response to the command, or the monitoring unit 11 transmits the information from the monitored device 1 at an arbitrary time interval. Information that is automatically output unilaterally is collected, and this information is temporarily stored in the storage unit 12.

The line connection unit 13 is composed of a modem or a terminal adapter (TA), and transmits and receives information.
Line control such as disconnection of the public line 1 is performed. As shown in FIG. 2, when a call signal a to the apparatus 2 is received from outside through the public line 3, the line connection unit 13 transmits a call notification signal b for notifying the incoming call monitoring unit 14 that there is a call. A function of intermittently outputting pulses at a predetermined pulse width and an interval while receiving the external call signal a, and a line disconnection to the incoming call monitoring unit 14 when the external call signal a is terminated. It has a function of outputting the notification signal c.

The incoming call monitoring unit 14 counts the number of pulses of the call notification signal b shown in FIG. 2, and when the line disconnection notification signal c is input, checks the number of pulses of these call notification signals, and the number of pulses is reduced. If the number of pulses matches any of the pre-registered information transmission request commands, it is determined that there has been an information transmission request command from outside, and an incoming call determination signal d consisting of the matched information transmission request command data. The transmission section
Output to 15. If the patterns do not match, it is determined that the call is not a legitimate call even if the call notification signal b and the line disconnection notification signal c are detected, and the subsequent operation is not performed. FIG. 3 shows a flowchart of the operation of the incoming call monitoring unit 14.

When the transmission unit 15 receives an incoming call determination signal d comprising command data, the transmission unit 15 stores the received data in the storage unit based on the command data.
The information stored so far is read out from 12 and output to the line connection unit 13 together with the information of the information collection device 4 which is a preset transmission destination. The line connection unit 13 reconnects the public line to the telephone number of the information collecting device 4 based on the information of the transmission destination, and transmits the calling signal e to the information collecting device 4 as the transmission destination through the public line 3 to the device 2. After transmitting and confirming the incoming call, the information stored in the storage unit 12 is transmitted.

Next, the configuration of the information collecting device 4 will be described in detail. The information collecting device 4 is connected to the public line 3
, A transmission receiving unit 22, a storage unit 23 for storing collected information, a transmission requesting unit 24,
It comprises a display unit 25. The line connection unit 21 is composed of a modem or a terminal adapter (TA), and performs line control such as transmission and reception of information and disconnection of the public line 3. The line connection unit 21 has a function of automatically receiving an incoming call signal (the above-mentioned call signal e) from the outside. When the automatic incoming call is received, the information transmitted through the public line 3 is transmitted to the transmission receiving unit 22. Output. The transmission receiving unit 22 classifies the information by checking the format and the transmission source of the input information, and stores the information in the storage unit 23.

The transmission requesting unit 24 outputs information on the call destination device-side answering device 2 and a call request signal f to the line connection unit 21 according to a preset information collection schedule or the like. When the call request signal f is input, the line connection unit 21 performs line control and performs a call to the local response device 2.
Make the actual call to. This is the external call signal a shown in FIG. Then, the transmission request unit 24 makes a call for the set calling time (the time set in the information transmission request command), and then stops the calling. As shown in FIG. 2, a disconnection notification signal c is generated in the local response device 2 at the timing when this call is completed, and the operation of transmitting information is started. The calling time is
Even if it is common to all the machine side response devices 2, the machine side response device 2
It may be set every time.

Also, through the operation / display unit 25, a storage unit
The information stored in 23 is arbitrarily selected, taken out, displayed on a screen, or printed. The operation of the remote response system will be described with reference to the flowchart of FIG. Step-1 First, the information collection device 4 transmits and disconnects a telephone call signal a to the called information response device 2 through the public line 3 according to a preset information collection schedule or the like. The interval between the transmission and the disconnection is the above call time. Step-2 Upon receiving the call signal a of the telephone of the public line 3, the machine-side answering device 2 confirms the time of the call signal by counting the number of pulses, and when the call signal ends,
Whether the command is an information transmission request command is confirmed by the stored number of pulses. Steps -3 and 4 Subsequently, the device-side response device 2 confirms the transmission request command,
A telephone call signal e is transmitted to the information collection device 4 through the public line 3. Step-5 The information collecting device 4 automatically receives an incoming call in response to the calling signal e of the local response device 2 of the public line 3. Step-6: The machine-side answering device 2 confirms the automatic incoming call, and
The information of the monitored device 1 accumulated through the communication is transmitted to the information collecting device 4. Step-7 The information collecting device 4 classifies and accumulates information of the monitored device 1 transmitted through the public line 3.

As described above, the machine-side response device 2 does not perform an incoming call operation, determines whether the command is an information transmission request command based on the call signal a, and determines that the command is an information transmission request command. By connecting the public line 3 from the side and transmitting the information to the information collecting apparatus 4, the information can be transmitted only to the specific information collecting apparatus 4, and it is possible that the information coincides with the specific information collecting apparatus 4 or that the information is transmitted by a third party. Even if the access method to the response device 2 is known, it is possible to prevent the information from being transmitted from the response device 2 to the third party, and to improve the confidentiality of the information. In addition, it is no longer possible to respond to a wrong call or the like, and it is possible to prevent a malfunction of the machine-side response device 2.

Further, charging of the public line 3 is performed by the information collecting device 4.
Can be distributed to a plurality of machine-side response devices 2 without concentrating, and the concentration of charging can be eased. When the machine-side response device 2 of the present invention is a control device of a multi-story parking facility, and the information collecting device 4 is a monitoring device of a maintenance center of the multi-story parking facility,
Various measurement data of the multi-story parking facility stored in the control device is transmitted to the monitoring device of the maintenance center through the public line 3 according to the information request command of the monitoring device, collected and accumulated, and is used as maintenance data of each multi-story parking facility. used.

In this embodiment, the information transmission request is determined based on the number of pulses output during reception of the call signal a, that is, the time during which the call signal a is continuous (call time). However, it can be determined in other ways. An example of another method will be described with reference to FIG. As shown in FIG. 5, the transmission and disconnection of the calling signal a 'from the information collecting device 4 to the local response device 2 are repeated at predetermined time intervals (specific patterns).

The line connection unit 13 of the answering machine 2 forms a pulse-shaped call notification signal b 'when the reception of the call signal a' is confirmed, or forms a pulse signal when the disconnection of the call signal a 'is confirmed. And outputs it to the incoming call monitoring unit 14, and further outputs the signal b 'or c'
The pulse interval (time) is checked to see if the interval matches a predetermined interval. If the interval matches, it is determined that there has been an information transmission request. Output d.

[0022] Also in this method, it is possible to determine the information transmission request. In the present embodiment, the line connection unit 13
Are transmitted to the incoming call monitoring unit 14, but the line connection unit 13 and the incoming call monitoring unit 14 are connected (general external modem) using RS232, and the line connection unit 13 As a paging signal, a character string (for example, “RING” or the like) corresponding to the paging signal a is output to the incoming call monitoring section 14 instead of the above-described paging signal a. By stopping the string as a disconnect,
For example, it is determined whether or not the command matches a pre-registered command based on the pattern of the number of repetitions or the cycle of the character string.
May be output to the transmission unit 15.

[0023]

As described above, according to the present invention, the information management responding unit does not perform the incoming call operation, determines whether the information is to be transmitted by the information collecting unit based on the call signal, and, if determined, determines whether the information is transmitted. By connecting the public line from the response unit and transmitting the information to the information collection unit, the information can be transmitted only to the specific information collection unit, and the confidentiality of the information can be improved. And the information management responder can be prevented from malfunctioning.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a remote response system using a communication method using a public line according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of signals of the remote response system.

FIG. 3 is a flowchart showing a procedure for determining a transmission request in the remote response system.

FIG. 4 is a flowchart illustrating an operation of the remote response system.

FIG. 5 is a signal characteristic diagram of a remote response system using a communication method according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monitored device 2 Machine side response device 3 Public line 4 Information collection device 11 Monitoring unit 12 Storage unit 13 Line connection unit 14 Incoming call monitoring unit 15 Transmission unit 21 Line connection unit 22 Transmission reception unit 23 Storage unit 24 Transmission request unit 25 Operation Display unit a, a ', e paging signal b, b' paging notification signal c, c 'disconnection notification signal d paging determination signal f paging request signal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukihiro Terada 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka F-term in Hitachi Zosen Corporation 5K101 KK12 LL01 MM07 NN21 RR15 RR21 RR24 UU05

Claims (3)

[Claims] 1. A method of communicating through a public line between an information management response unit having information and an information collection unit that outputs an information request command to the information management response unit and collects the information. The information collection unit sends and disconnects a telephone call signal through the public line to the information management response unit, and the information management response unit stores the call signal when receiving the telephone call signal of the public line. When the call signal is terminated, it is determined whether the command is an information request command of the information collection unit based on the stored call signal, and if it is determined that the command is an information request command of the information collection unit, the information collection unit is notified of the call signal of the telephone through the public line. Originates a call, the information collection unit automatically receives an incoming call in response to the call signal of the information management response unit of the public line, and the information management response unit confirms the automatic reception and sends it through the public line. Communication method using a public line and transmits the flickering information to the information collection unit. 2. The information collection unit repeats transmission and disconnection of a call signal in a specific pattern, and the information management response unit determines that the reception and termination of the call signal have been repeated in a specific pattern. 2. The communication method using a public line according to claim 1, wherein it is determined whether the command is an information request command. 3. An information management response unit is connected to a monitored device that manages information, accumulates information of the monitored device, connects a public line to an information collection unit, and stores information of the monitored device. 3. A communication method using a public line according to claim 1 or 2, wherein